Apparatus for the manufacture of white lead



(No Model.)

A. 0. & s. R. BRADLEY. APPARATUS FOR THE MANUFACTURE 0? WHITE LEAD.

Patented May 28, 1889 JAZZQK 5? Mm m- View M21 1 phor, Wahlnglo NITED .STATES ATENT rrioE.

ARTHUR CROSSMAN BRADLEY AND STEPHEN ROVE BRADLEY, OF BROOKLYN, NEXV YORK.

APPARATUS FOR THE MANUFACTURE OF WHITE LEAD.

SPECIFICATION forming part of Letters Patent No. 404,253, dated May 28, 1889. Application filed August 19, 1887. Serial No. 247,353. (No model.)

To all whom it may concern- Be it known that we, ARTHUR CROSSMAN BRADLEY and STEPHEN Rows BRADLEY, both of Brooklyn, in the county of Kings and State of New York, have jointly made invention of certain new and useful Improvements in 0011- verting- Chambers for the Manufacture of \Vhite Lead, and for other purposes for which they may be useful; and we do hereby declare that the following is a full, clear, and exact description and specification of the same.

The object of this invention is to facilitate the combination of substances in a converting-chamber and to discharge the contents thereof mechanically.

To these ends our invention consists of certain new combinations of devices which are recited in the claims at the close of this specification. In order that these combinations may be fully understood, we have represented in the accompanying drawings, and will pro- ,ceed to describe, a converting-chamber and its appurtenances or adjuncts constructed in the best form in which we have embodied our invention at this date, it being understood that various modifications may be made in the construction of the apparatus as may be suggested by circumstances or the judgment of constructors or users without departing from the principle of our invention.

Figure l of said drawings represents acentral vertical. section of said converting-chamber. Fig. 2 rcpresentsa horizontal section of the same at the line so as of Fig. 1.

As our invention was made primarily for the manufacture of white lead by the liquid process, in which a solution of the basic acetate of lead is subjected to the action of carbonic-acid gas, we will describe the said convetting-chamber and its adjuncts with reference to that manufacture.

The convertingchamber A of the said apparatus is cylindrical and may be of any convenient size, that which has been used successfully being six feet in diameter and twenty feet high. As this converting-chamber is employed in subjecting a liquid to the action of a gas, it must be substantially water-tight and gas-tight to prevent the escape of the liquid and the gas except at the openings provided, as hereinafter described. The chamber is litted internally with a series of shelves, B BB, each of which is partly cut away at one side, so as to form an opening, 0, through which the solution may escape to the next shelf beneath, and through which the gas may pass the openings of the shelves also alternate, or are not directly above one another, and the shelves touch the sides of the chamber (except at the above openings) and are what we term solidthat is, without perforations. Consequently the solution flowing through the opening of one shelf is compelled to traverse the surface of the next beneath, or a material portion of it. The gas also is compelled to pass over the shelves in a circuitous manner. The opening is large enough atthe center of each shelf to permit the revolution of an upright shaft, D, whose upper end is extended through the top of the chamber, and is connected with mechanism by means of which it is caused to re volve slowly. This shaft is fitted with arms cl d, which are revolved with it, and it is preferred that there should be one arm, d, adjusted to revolve near the top of each shelf, and one arm, (1, adjusted to revolve near the bottom of each shelf, so that the arms in their revolution may sweep or scrape off such white lead as accumulates upon the shelves. The upper end of the converting-chamber is fitted with a pipe, E, for supplying the solution, and with an opening, F, for the escape of gases. The lower end of the converting-chamber is provided with an opening, G, for the introduction of carbonic-acid gas, and with an escape-pipe, H, for the escape of the solution of acetate of lead and of the white lead, which is mechanically mixed with it. The upright sides of the apparatus may be provided with openings fitted with doors, so that the interior may be cleansed when found expedient.

\Vhen the apparatus is in use, the shaft and arms are caused to revolve slowly by power. The solution to be acted upon is permitted to enter the converting-chamber by the pipe or nozzle E, and its rate of passage may, if necessary, be regulated by means of a valve or stop-cock in the said pipe. The gas is permitted to enter the converting-chamber preferably by the opening G at the lower end of the chamber. The spent solution is per mitted to escape by the opening H at the lower end oi the chamber, and the spentgas is permitted to escape preiferahlyby the opening ii at the top of the chamber. The solution ilows over each shelf in a thin iihn or sheet and escapes to the next shell beneath by the opening or such part oi? the transverse area oi? the chamber as is not occupied by the shell. The precipitated white lead deposits more or less upon the shelves, and whatever deposit is within reach of the arms is swept or scraped off and discharged with the spent solution through the opening for that purpose atihe lower end oi the chamber. If the chamber he made polygonal, the arms will sweep oil? whatever is within their reach in revolving, while the corners will :iill. up until no further accumulation will take place in them.

Iii preferred, the arms, instead of being caused to revolve, may be caused to turn a part oi? a revolution in. one direction and. a part of a revolution in the opposite direction, the openings in the shelves being so located. that the accumulated material, is sweptto thcmhy the movement oi the arms. In case both ingredients that are to act upon each other are oi such a character that; they can he introduced through a single entry-opening, only one (awning is necessary at the upper partof the convcrting-chamber and only one discharge-opening is required at the lower part thereoi'. ll? eX' edient, also, only one set of the arms may he used.

A process [or the man u facture olwhite lead that may he practiced by the use of our joint invention hashecn describedbyArthur Crossman liradlev in an application for a patent; but we jointly make no joint claim to that process, or toany other tln'l-tmaybe practiced in whole or in part by means oi? our joint invent-i on llaving thus described our appm'atus [or mannl'aeturing white lead by a process that involves a use of a solution and of a gas, and which, therefore, requires a construction of the convcrtingchamher which will confine the liquid and the while the one is acting upon the other, we declare that we are aware that grain-driers and other machines for operating on solid substances have been constructed with scrapers and shelves, and therefore we do not claim such combinations, broadly.

lVe claim as our invention 1. The combination, substantially as before set forth, of the tight converting-chambcr, its solid shelves, each of said shelves having an opening in a different vertical. plane from the opening in the next adjacent shelf, and the scraping'arms arranged to sweep one side of said shelves.

2. The combination,substantially as before sci;- iforth, oi? the tight eonvertirig-chamber, its solid shelves, each o'if said shelves provided with an opening in a diiierexrt vertical plane from the opening or openings of its next adjacent shell" or shelves, the shaft, and the scraping-arms arranged to sweep over the under sides oi? said shelves.

3. The combination, snhsiantially as before set forth, of the tight convcrting-elnunller, its solid shelves, each of said shelves provided with an opening in a dilit'erent vertical plane from the opening or openings of its next adjacent sheli or shelves, the shaft, the scraping-arms, the entry-opening for liquid at ihe top off said chamber, and the exiij-o 'lening for liquid at the lower end of said chamber.

In witness whereolj' we have hereto set our hands this l7th (lay of August, A. l). 1987. A lt'lll lllt UlttlSSlll A N ll ltAlllil l. S'llllfll llN ltO \l' ll ldtAlllil l l. Witnesses:

loan 1'. l noirnmeHAM, FREDK. .l. Rfrmnr. 

